351 Answered Questions for the topic astronomy

14d

Long Exposure Pictures (Circular? vs. Streaks. Center Point? Always Same? What is the Star?)

To an expert that can help my curiosity,How is it the night sky becomes a circular streak of chalk like lines on a space/sky canvas on a long exposure pictures? Would it not consist of streaks... more
Astronomy

25d

Which type of star would have the longest lifespan?

A. none of the options, we cannot determine the lifespan without its compositionB. High mass starC. Medium mass starD. Low Mass star

06/26/22

About gravity my biggest question

I have a big question. According to Newton's law of Gravitation, every single atom attracts every other atom in the universe. The scientists have hypothesised a partical, gluon, to be responsible... more
Astronomy

05/20/22

How do astronomers measure extreme cosmological distances?

A: Cepheid variable stars. B: Tully-Fisher correlation. C: Geometric parallax. D: Hubble’s Law.
Astronomy

05/20/22

Which of the following is a characteristic of active galaxies?

A: They generally exhibit no signs of explosive activity. B:Their energy emission cannot be explained as the accumulated emission of their stars. C: Their energy output is steady in time D: They... more
Astronomy Physics

04/09/22

Does dark energy mean repulsive gravity?

Astronomy

02/16/22

Objects A and B are orbiting each other. Object A has twice the mass of Object B. What can you say about their orbits?

Objects A and B are orbiting each other. Object A has twice the mass of Object B. What can you say about their orbits?A: The orbital path of Object A is smaller than the orbital path of Object B.B:... more
Astronomy

02/16/22

Why don’t planets fly off into space? What’s keeping them in place? Also try to explain why planets don’t fall directly into the Sun.

Why don’t planets fly off into space? What’s keeping them in place? Try to reason why planets don’t fall directly into the Sun.
Astronomy

02/04/22

pls help me with work

Weight is mass times the acceleration of gravity. If an individual weighs 188 pounds on Earth, how much will they weigh on Jupiter? Assume the acceleration of gravity on Jupiter is 2.76 times the... more
Astronomy

02/04/22

pls help me :))

The radius of Jupiter is about 72.0 × 103 km. The radius of the Sun is about 72.0 × 104 km. How many Jupiter volumes would fit inside the Sun's volume?
Astronomy

02/04/22

I'm really confused pls help

Ceres, the largest asteroid and a dwarf planet, has a semi-major axis of about 2.67 AU. What is Ceres’ orbital period in years about the Sun?
Astronomy

01/18/22

pls help me with this

If a planet was located approximately 23 thousand light-years from the center of a galaxy and orbits that center once every 273 million years, how fast is the planet traveling around the galaxy in... more
Astronomy Science

12/31/21

photons and how the massless atom miraculously weighs less than an electron

an proton is a massless particle which can travel at the speed of light because of this. how does it weigh more than an electron.
Astronomy

11/15/21

Astronomy Question

Use the link below to help answer the questions:https://phet.colorado.edu/sims/html/gravity-and-orbits/latest/gravity-and-orbits_en.htmlWhen you open the link, check the gravity force checkbox and... more
Astronomy

10/07/21

Life in the universe.

Determine the densities of the following exoplanets and classify them.Epsilon 3Mass: 15.01 MERadius: 4.36 REDensity: ................. g/cm3Classification: rocky/Terrestrial or gas giant or ice... more

09/30/21

How can a black hole be electricaly charged if it sucks up all matter (including electrons and protons)

How can a black hole be electricaly charged if it sucks up all matter (including electrons and protons)?thanks!
Astronomy

09/29/21

Electromagnetic waves carry energy.

Astronomy

09/22/21

Astronomer class

NASA is currently developing the Space Launch System, or SLS, which will be arguably the most powerful rocket ever built. It is designed primarily to transport astronauts to Mars with a travel time... more
Astronomy

09/22/21

Astronomer class

What speed would be required in order to reach the nearest star within a reasonable travel time of 10 years? Give your answer in units of kilometers per year (km yr-1)

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